172 
BOTANY. 
and pappus. Fig. 3. Corolla. Fig. 4. Stamen. Fig. 5. Style ; all enlarged 
three diameters. (607.) 
Ch^nactis Douglasii, Hook. & Arn. {Ch. achilleafolia, II. & A.) 
Biennial and sometimes annual, whitened with a close tomentum, or rarely 
smoothish ; stems from 2-3° high, simple or niuch-branchcd, often several 
from one root ; leaves somewhat fleshy, 1-3' long, ovate-oblong in outline, 
2-3-pinnatifid with very numerous and often crowded minute oblong-obovate 
or rounded lobes ; heads few-many, corymbed ; involucres turbinate or cam- 
panulate, the oblong-linear scales in 1-2 series; flowers 6-7" long, whitish 
or flesh-colored ; corollas pubescent ; marginal ones scarcely larger ; achenia 
linear, hispid, blackish, as long as the corolla; pappus of about 10 unequal 
oblong or lanceolate erosely denticulate scales, i-§as long as the achenium.— 
A vanable plant, presenting numerous forms dependent upon exposure, soil, 
&c., but none of them can be considered well-marked and permanent 
varieties. The name Douglasii, being older than achilUcefolia, is taken for 
the united species. The larger pappus-scales sometimes have a well-defined 
mid-nerve. A good figure of a common form of the plant is given in Plate 
VI of Stansbury's Report. Oregon and Cahfornia to Colorado and Arizona ; 
Western Nevada, (Bloomer ! and Anderson !) Common throughout Nevada 
and Utah, from 4,000 feet elevation upward ; May-October. (608.) A 
dwarf alpine form, with the leaves having densely crowded minute lobes 
and the heads few and rather large, is Brewer's 1901, from Cahfornia, and 
tlu3 same was found on rocky ridges of the Uintas about Bear River Canon, 
at 10,000-12,000 feet elevation. (609.) 
Ch^enactis stevioides. Hook. & Arn. Annual, glabrous, or at first 
puberulent above ; stems 6-10' high, branched from the base, corymbose 
above; leaves 1-2-pinnately divided, the divisions linear, obtuse, entire, i" 
wide ; involucre glandular-puberulent, the scales spatulate-oblong, in two 
rows; flowers white or flesh-color; corollas tubidar-fuunel-shaped, the 
marginal ones shorter and a Uttle more expanded ; achenia hirsute; pappus 
of 4-5 subequal lanceolate acute denticulate scales.— Oregon and California 
to New Mexico ; Strong's Knob, Great Salt Lake, (Stansbury.) Foot-hills 
and ridges of Trinity Mountains and Reese River Valley, Nevada, and on 
Stansbury Island, Great Salt Lake ; 4-5,000 feet elevation ; May-July. (610.) 
Cii^NACTis CARPHOCLiNiA, Gray. Bot. Mex. Bound., p. 94. Annual (I,) 
at first lanulose, soon glabrous, somewhat viscid; stem much branched; 
